I think this is a prototype to Mario's model design in Luigi's Mansion, and consequently, to nearly every game up to today (though after LM his head changed a little, but not in his Sunchine in game model, and again in recent years). His geometry seems similar to LM's but a little different in some parts like his mustache, and a little lower poly on some parts like the hands for example. His eyebrows' and eyes' shapes even matches the ones in LM.